Frame for dynamo-electric machines.



No. 723,019. PATENTED MAR.r 17, 1903- R. PFEIFER. FRAME FOR DYNAMqELEGTRIO MACHINES.

APPLICATION FLED FEB. 18, 1 902.

N0 MODEL.

UNITED STATES PATENT OFFICE.

RUDOLF PFEIFER, OF OH'ABLO'ITENBURG, GERMANY.

FRAME FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 723,019, dated March17, 1903. Application filed February 18| 1902. SerialNo. 94.679. (Nomodel.)

To aZZ whom it may concern.-

Be it known that I, RUDQLF PFEIFER, engineer, a subject of the GermanEmperor, residing at 71 Schliiterstrasse, Charlottenburg,

near Berlin, Germany, have invented certain,

exact description of the invention, such, as.

will enable others skilled in the art to which it appertains to make anduse the same.

My invention refers to frames for dynamoelectric machines, and moreespecially to large machines of this kind in which the stationary activeiron core is disposed in the shape of a ring.

The invention consistsin forming the frame supporting the activelaminated iron core by combining suitable sections of rolled iron in themanner hereinafter described, by which an exceedingly cheap andeffective construc-' tion is obtained. f

Of the accompanying drawings, Figure l is an end view of a dynamo-framewith the stationary part of the active iron in place and the rotary partremoved. Figs. 2 to 9 are difierent modifications of the section of saidframe and active iron.

In all the figures, I is the activelaminated iron core, disposed in theshape of a ring, as is usual in large machines. The core is assumed tobe held together by bolts (not shown in the drawings) passing through itin the usual way and on either side a strengthening and supporting pieceS, preferably of an L-shaped section, is fastened.

The supporting-frame proper-is designated by the reference-letter F. Itscharacteristic feature consists in this that it is not made ofcast-iron, as was usual hitherto, but of wrought-iron. In building largemachines it is found that a very considerable item in the cost is theexpense of. transporting so unwieldy and heavy pieces from thebuildingshop to the place where the machine is to be erected. It isevident that a wrought-iron supporting-frame can be made Very muchlighter than acast-iron frame, though of equal strength. However, thedifficulty in the way of the general use of wrought-iron frames is thatthe cost of their production is greater than that of cast-iron frames.The present invention is directed to a mode of construction ofwroughtiron frames by which the cost of their production is reduced toaminimum and at the same time a maximum strength is obtained with aminimum of weight. Besides, it is a special feature of these frames thatfor equal diameters of the machine they can be'produced in equal sizesthough the cross-sections of the laminated core may vary. For attainingthese ends I build up the frame of pieces of rolled iron of the usual L,U, T, double-T sections, or of combinations of these sections.

Fig. 2 shows a complete section of the frame together with thestationary active core. In this case a U-shaped section has beenselected for forming the frame F. In fact, the frame is merely a pieceof rolled iron with a U- shaped section as it comes upon the marketwithout regard to its future destination bent into a circular shape. Thesupporting-pieces S S are fastened to the frame F by means of bolts B B.I

Fig. 3 shows the use of a double-T section arranged correspondingly.

In the modifications shown in Figs. 4 and 8 two L and, respectively, Tsections are combined to form the frame F, and in the modificationsshown in Figs. 5 and 9 two L-sections are combined with a U and adouble-T section, respectively.

Figs. 6 and 7 show modifications in which a frame constructed accordingto my invention is adapted to a cross-section of core which is too broadto be supported by a single-section frame. InFig. 6 two U-sections arecombined and in Fig. 7 two double-T sections.

In all of the modifications shown as utilized by me the L shape is thebasis from which by divers combinations are formed the U, T, double- U,double-T, &c.as, for instance,- the U-shaped section is composed of twoL- sections having their base-line joined, the T- section is composedoftwo L-sections having their vertical stems joined. I therefore considerthese various modifications as composite figures formed of the unittheL-shaped section-and desire that this specification and the manner inwhich the same is to be performed, I declare that What I claim is 1. Thecombination with the annular stationary core of a dynamo, of asupportingframe consisting of a plurality of segments of wroughtangle-iron.

2. The combination with the iron core of a dynamo, of asupporting-frameconsisting of pieces of wrought-iron having a cross-section formingrectangular figures and bent into a curve corresponding to the size ofthe machine.

3. The combination with the annular stationary core of a dynamo, of awrought-iron supporting-frame consisting of rolled pieces having theusual sections forming rectangular figures, and bent into a curvecorresponding to the size of the machine.

at. The combination with the annular stationary iron core of a dynamo,of supportingpieces of angle-iron, a supporting-frame consisting of aplurality of pieces of Wroughtnon of rectangular section bent into acurve corresponding to the size of the machine, and

bolts connecting the said supporting-pieces with the said frame.

5,7 The combination with the annular stationary core ofa dynamo, ofsupporting-pieces preferably made of wrought-iron of an L- shapedcross-section and fastened to said core in the usual manner, asupporting-frame consisting of a plurality of L-shaped wroughtironpieces bent to form segments and secured to the supporting-pieces bysuitable bolts.

6. The combination with the annular stationary core of a dynamo, of asupportingframe formed of the plurality of pieces of Wrought-iron of Uor double-L shape in crosssection and bent into a curve corresponding tothe size of the machine.

7; The combination with an annularstationary: iron core of a dynamo, ofsupportingpieces having an L-shaped cross-section, an annularsupporting-frame consisting of a'plurality of pieces of Wrought-ironforming in cross-section combinations of L-shaped figures and bent intoa curve constituting segments of the complete frame, and suitable meansfor securing the supporting-pieces to the annular frame.

In testimony whereof I have affixed my signature in presence of twowitnesses.

7V RUDOLF PFEIFER. Witnesses:

HENRY HASPER, WoLnEMAR HAUPT.

